This was becoming an ANSI Standard Forth for the Amiga,
but I stopped using my Amiga before the Standard was
complete, so JaxForth for the Amiga only tracks the
Standard to dpANS-5 (about 1991). Source &
executable.

My 1992 book on the Forth Standard from M&T Books
is out of print, but you can download these corrigienda, emenda
and addenda (Rev. 1.6, text only) to the original work
(ISBN 1-55851-277-2). 3347 bytes

Jeff Fox for some reason is an "overloaded name" in
Forth! This Jeff Fox lives in California and is
involved with Forth-based microprocessors. If you're into
Forth at the silicon level, don't miss this one.

Billed as "a sometimes minimal FORTH compiler and
tutorial for Linux / i386 systems", JonesForth is an
exercise in Literate Programming which not only implements
a simple x86 Forth in Gnu Assembly but also gives you a
technological overview of Forth implementation!

Phil Koopman is one of the outstanding computer
scientists to have worked with Forth. Dr. Koopman designed
the WISC (Writeable Instruction Set) chip, among other
accomplishments. His page on
Current Stack Hardware is also interesting.

Good place to start learning about Wm. "Mitch"
Bradley's brainchild, Open Boot, the forth kernel which
many modern minicomputers use to boot and to test hardware
modifications. Open Boot is the most widely used Forth
program in the world.